package com.scst.aspect;


import com.scst.annoation.AutoFill;
import com.scst.context.BaseContext;
import com.scst.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Slf4j
@Component
public class AutoFillAspect {
   @Pointcut("execution(* com.scst.mapper.*.*(..)) && @annotation(com.scst.annoation.AutoFill)")
    public void autoFillPointCut() {}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {

       log.info("自动填充字段");
       //获取到当前被拦截的数据类型
        MethodSignature signature= (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill=signature .getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType=autoFill.value();
        //获取到当前被拦截的方法的参数-实体对象
        Object[]  args= joinPoint.getArgs();
        if(args==null || args.length==0){
            return;
        }
        Object entity=args[0];
        //准备赋值的数据
        LocalDateTime now= LocalDateTime.now();
        Long currentId= BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射赋值
        if(operationType==OperationType.INSERT) {
           Method setCreateTime;
            setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime",LocalDateTime.class);
            setCreateTime.invoke(entity,now);
        }
    }
}
